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What they are good at is predicting what's after the text. The problem of predicting what's next could be used to create a universal artificial intelligence (there's a mathematical definition for this). I.e. if you have a system which is very good at predicting what's next, you could get to very powerful AI.
If you are interested, you could read about it here: http://www.hutter1.net/ai/uaibook.htm